1 Department of Orhtopaedic Surgery, Teikyo University School of Medicine, 1-2-11 Kaga, Itabashi-ku, Tokyo, 173-8606, Japan; Department of Health Research Methods, Evidence & Impact, McMaster University. 1280 Main Street West, Hamilton, Ontario, L8S 4K1, Canada. Electronic address: natsumi613@gmail.com.
2 Department of Orhtopaedic Surgery, Teikyo University School of Medicine, 1-2-11 Kaga, Itabashi-ku, Tokyo, 173-8606, Japan.